Prores 4444 Clips Not Playing

Hey all

So I just converted from Mac to PC and none of my clips encoded in Prores 4444 codec at 4K resolution play well in Premiere CS6 on Windows 8. When they first load into the project I can play a clip then any clips after that just result in Media Pending and never play. The clips play fine in QT player.

Any ideas what could be causing this?

Thanks!